Index: llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
===================================================================
--- llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
+++ llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
@@ -2796,6 +2796,18 @@
   if (match(Op0, m_And(m_Or(m_Specific(Op1), m_Value(C)), m_Value(A))))
     return BinaryOperator::CreateOr(Op1, Builder.CreateAnd(A, C));
 
+  // (~(A | B) & C) | ~(A | C) --> ~((B & C) | A)
+  if (match(Op0, m_OneUse(m_c_And(m_OneUse(m_Not(m_Or(m_Value(A), m_Value(B)))),
+                                  m_Value(C))))) {
+    if (match(Op1, m_OneUse(m_Not(m_c_Or(m_Specific(A), m_Specific(C))))))
+      return BinaryOperator::CreateNot(
+          Builder.CreateOr(Builder.CreateAnd(B, C), A));
+
+    if (match(Op1, m_OneUse(m_Not(m_c_Or(m_Specific(B), m_Specific(C))))))
+      return BinaryOperator::CreateNot(
+          Builder.CreateOr(Builder.CreateAnd(A, C), B));
+  }
+
   if (Instruction *DeMorgan = matchDeMorgansLaws(I, Builder))
     return DeMorgan;
 
Index: llvm/test/Transforms/InstCombine/and-xor-or.ll
===================================================================
--- llvm/test/Transforms/InstCombine/and-xor-or.ll
+++ llvm/test/Transforms/InstCombine/and-xor-or.ll
@@ -927,12 +927,9 @@
 
 define i32 @or_and_not_not(i32 %a, i32 %b, i32 %c) {
 ; CHECK-LABEL: @or_and_not_not(
-; CHECK-NEXT:    [[OR1:%.*]] = or i32 [[B:%.*]], [[A:%.*]]
-; CHECK-NEXT:    [[NOT1:%.*]] = xor i32 [[OR1]], -1
-; CHECK-NEXT:    [[OR2:%.*]] = or i32 [[A]], [[C:%.*]]
-; CHECK-NEXT:    [[NOT2:%.*]] = xor i32 [[OR2]], -1
-; CHECK-NEXT:    [[AND:%.*]] = and i32 [[NOT2]], [[B]]
-; CHECK-NEXT:    [[OR3:%.*]] = or i32 [[AND]], [[NOT1]]
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[C:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TMP2:%.*]] = or i32 [[TMP1]], [[A:%.*]]
+; CHECK-NEXT:    [[OR3:%.*]] = xor i32 [[TMP2]], -1
 ; CHECK-NEXT:    ret i32 [[OR3]]
 ;
   %or1 = or i32 %b, %a
@@ -946,12 +943,9 @@
 
 define i32 @or_and_not_not_commute1(i32 %a, i32 %b, i32 %c) {
 ; CHECK-LABEL: @or_and_not_not_commute1(
-; CHECK-NEXT:    [[OR1:%.*]] = or i32 [[B:%.*]], [[A:%.*]]
-; CHECK-NEXT:    [[NOT1:%.*]] = xor i32 [[OR1]], -1
-; CHECK-NEXT:    [[OR2:%.*]] = or i32 [[A]], [[C:%.*]]
-; CHECK-NEXT:    [[NOT2:%.*]] = xor i32 [[OR2]], -1
-; CHECK-NEXT:    [[AND:%.*]] = and i32 [[NOT2]], [[B]]
-; CHECK-NEXT:    [[OR3:%.*]] = or i32 [[AND]], [[NOT1]]
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[C:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TMP2:%.*]] = or i32 [[TMP1]], [[A:%.*]]
+; CHECK-NEXT:    [[OR3:%.*]] = xor i32 [[TMP2]], -1
 ; CHECK-NEXT:    ret i32 [[OR3]]
 ;
   %or1 = or i32 %b, %a
@@ -965,16 +959,45 @@
 
 define i32 @or_and_not_not_commute2(i32 %a, i32 %b, i32 %c) {
 ; CHECK-LABEL: @or_and_not_not_commute2(
-; CHECK-NEXT:    [[OR1:%.*]] = or i32 [[B:%.*]], [[A:%.*]]
-; CHECK-NEXT:    [[NOT1:%.*]] = xor i32 [[OR1]], -1
-; CHECK-NEXT:    [[OR2:%.*]] = or i32 [[A]], [[C:%.*]]
-; CHECK-NEXT:    [[NOT2:%.*]] = xor i32 [[OR2]], -1
-; CHECK-NEXT:    [[AND:%.*]] = and i32 [[NOT2]], [[B]]
-; CHECK-NEXT:    [[OR3:%.*]] = or i32 [[AND]], [[NOT1]]
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[C:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TMP2:%.*]] = or i32 [[TMP1]], [[A:%.*]]
+; CHECK-NEXT:    [[OR3:%.*]] = xor i32 [[TMP2]], -1
+; CHECK-NEXT:    ret i32 [[OR3]]
+;
+  %or1 = or i32 %b, %a
+  %not1 = xor i32 %or1, -1
+  %or2 = or i32 %a, %c
+  %not2 = xor i32 %or2, -1
+  %and = and i32 %not2, %b
+  %or3 = or i32 %and, %not1
+  ret i32 %or3
+}
+
+define i32 @or_and_not_not_commute4(i32 %a, i32 %b, i32 %c) {
+; CHECK-LABEL: @or_and_not_not_commute4(
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[C:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TMP2:%.*]] = or i32 [[TMP1]], [[A:%.*]]
+; CHECK-NEXT:    [[OR3:%.*]] = xor i32 [[TMP2]], -1
 ; CHECK-NEXT:    ret i32 [[OR3]]
 ;
   %or1 = or i32 %b, %a
   %not1 = xor i32 %or1, -1
+  %or2 = or i32 %c, %a
+  %not2 = xor i32 %or2, -1
+  %and = and i32 %not2, %b
+  %or3 = or i32 %and, %not1
+  ret i32 %or3
+}
+
+define i32 @or_and_not_not_commute5(i32 %a, i32 %b, i32 %c) {
+; CHECK-LABEL: @or_and_not_not_commute5(
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[C:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TMP2:%.*]] = or i32 [[TMP1]], [[A:%.*]]
+; CHECK-NEXT:    [[OR3:%.*]] = xor i32 [[TMP2]], -1
+; CHECK-NEXT:    ret i32 [[OR3]]
+;
+  %or1 = or i32 %a, %b
+  %not1 = xor i32 %or1, -1
   %or2 = or i32 %a, %c
   %not2 = xor i32 %or2, -1
   %and = and i32 %not2, %b
@@ -982,6 +1005,54 @@
   ret i32 %or3
 }
 
+define i32 @or_and_not_not_commute6(i32 %a, i32 %b, i32 %c) {
+; CHECK-LABEL: @or_and_not_not_commute6(
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[C:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TMP2:%.*]] = or i32 [[TMP1]], [[A:%.*]]
+; CHECK-NEXT:    [[OR3:%.*]] = xor i32 [[TMP2]], -1
+; CHECK-NEXT:    ret i32 [[OR3]]
+;
+  %or1 = or i32 %b, %a
+  %not1 = xor i32 %or1, -1
+  %or2 = or i32 %a, %c
+  %not2 = xor i32 %or2, -1
+  %and = and i32 %not2, %b
+  %or3 = or i32 %not1, %and
+  ret i32 %or3
+}
+
+define i32 @or_and_not_not_commute7(i32 %a, i32 %b, i32 %c) {
+; CHECK-LABEL: @or_and_not_not_commute7(
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[C:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TMP2:%.*]] = or i32 [[TMP1]], [[A:%.*]]
+; CHECK-NEXT:    [[OR3:%.*]] = xor i32 [[TMP2]], -1
+; CHECK-NEXT:    ret i32 [[OR3]]
+;
+  %or1 = or i32 %b, %a
+  %not1 = xor i32 %or1, -1
+  %or2 = or i32 %c, %a
+  %not2 = xor i32 %or2, -1
+  %and = and i32 %b, %not2
+  %or3 = or i32 %and, %not1
+  ret i32 %or3
+}
+
+define i32 @or_and_not_not_commute8(i32 %a, i32 %b, i32 %c) {
+; CHECK-LABEL: @or_and_not_not_commute8(
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[C:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TMP2:%.*]] = or i32 [[TMP1]], [[A:%.*]]
+; CHECK-NEXT:    [[OR3:%.*]] = xor i32 [[TMP2]], -1
+; CHECK-NEXT:    ret i32 [[OR3]]
+;
+  %or1 = or i32 %a, %b
+  %not1 = xor i32 %or1, -1
+  %or2 = or i32 %c, %a
+  %not2 = xor i32 %or2, -1
+  %and = and i32 %not2, %b
+  %or3 = or i32 %and, %not1
+  ret i32 %or3
+}
+
 define i32 @or_and_not_not_extra_not_use1(i32 %a, i32 %b, i32 %c) {
 ; CHECK-LABEL: @or_and_not_not_extra_not_use1(
 ; CHECK-NEXT:    [[OR1:%.*]] = or i32 [[B:%.*]], [[A:%.*]]
@@ -1024,6 +1095,65 @@
   ret i32 %or3
 }
 
+define i32 @or_and_not_not_extra_and_use(i32 %a, i32 %b, i32 %c) {
+; CHECK-LABEL: @or_and_not_not_extra_and_use(
+; CHECK-NEXT:    [[OR1:%.*]] = or i32 [[B:%.*]], [[A:%.*]]
+; CHECK-NEXT:    [[NOT1:%.*]] = xor i32 [[OR1]], -1
+; CHECK-NEXT:    [[OR2:%.*]] = or i32 [[A]], [[C:%.*]]
+; CHECK-NEXT:    [[NOT2:%.*]] = xor i32 [[OR2]], -1
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[NOT2]], [[B]]
+; CHECK-NEXT:    [[OR3:%.*]] = or i32 [[AND]], [[NOT1]]
+; CHECK-NEXT:    call void @use(i32 [[AND]])
+; CHECK-NEXT:    ret i32 [[OR3]]
+;
+  %or1 = or i32 %b, %a
+  %not1 = xor i32 %or1, -1
+  %or2 = or i32 %a, %c
+  %not2 = xor i32 %or2, -1
+  %and = and i32 %not2, %b
+  %or3 = or i32 %and, %not1
+  call void @use(i32 %and)
+  ret i32 %or3
+}
+
+define i32 @or_and_not_not_extra_or_use1(i32 %a, i32 %b, i32 %c) {
+; CHECK-LABEL: @or_and_not_not_extra_or_use1(
+; CHECK-NEXT:    [[OR1:%.*]] = or i32 [[B:%.*]], [[A:%.*]]
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[C:%.*]], [[B]]
+; CHECK-NEXT:    [[TMP2:%.*]] = or i32 [[TMP1]], [[A]]
+; CHECK-NEXT:    [[OR3:%.*]] = xor i32 [[TMP2]], -1
+; CHECK-NEXT:    call void @use(i32 [[OR1]])
+; CHECK-NEXT:    ret i32 [[OR3]]
+;
+  %or1 = or i32 %b, %a
+  %not1 = xor i32 %or1, -1
+  %or2 = or i32 %a, %c
+  %not2 = xor i32 %or2, -1
+  %and = and i32 %not2, %b
+  %or3 = or i32 %and, %not1
+  call void @use(i32 %or1)
+  ret i32 %or3
+}
+
+define i32 @or_and_not_not_extra_or_use2(i32 %a, i32 %b, i32 %c) {
+; CHECK-LABEL: @or_and_not_not_extra_or_use2(
+; CHECK-NEXT:    [[OR2:%.*]] = or i32 [[A:%.*]], [[C:%.*]]
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[C]], [[B:%.*]]
+; CHECK-NEXT:    [[TMP2:%.*]] = or i32 [[TMP1]], [[A]]
+; CHECK-NEXT:    [[OR3:%.*]] = xor i32 [[TMP2]], -1
+; CHECK-NEXT:    call void @use(i32 [[OR2]])
+; CHECK-NEXT:    ret i32 [[OR3]]
+;
+  %or1 = or i32 %b, %a
+  %not1 = xor i32 %or1, -1
+  %or2 = or i32 %a, %c
+  %not2 = xor i32 %or2, -1
+  %and = and i32 %not2, %b
+  %or3 = or i32 %and, %not1
+  call void @use(i32 %or2)
+  ret i32 %or3
+}
+
 define i32 @or_and_not_not_wrong_a(i32 %a, i32 %b, i32 %c, i32 %d) {
 ; CHECK-LABEL: @or_and_not_not_wrong_a(
 ; CHECK-NEXT:    [[OR1:%.*]] = or i32 [[B:%.*]], [[D:%.*]]